217316 has 18 divisors (see below), whose sum is σ = 418950. Its totient is φ = 98560.

The previous prime is 217313. The next prime is 217319. The reversal of 217316 is 613712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (217313) and next prime (217319).

It can be written as a sum of positive squares in only one way, i.e., 193600 + 23716 = 440^2 + 154^2 .

It is not an unprimeable number, because it can be changed into a prime (217313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 260 + ... + 708.

It is an arithmetic number, because the mean of its divisors is an integer number (23275).

2²¹⁷³¹⁶ is an apocalyptic number.

It is an amenable number.

217316 is a deficient number, since it is larger than the sum of its proper divisors (201634).

217316 is a wasteful number, since it uses less digits than its factorization.

217316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475 (or 462 counting only the distinct ones).

The product of its digits is 252, while the sum is 20.

The square root of 217316 is about 466.1716422092. The cubic root of 217316 is about 60.1216052215.

It can be divided in two parts, 21 and 7316, that added together give a palindrome (7337).

The spelling of 217316 in words is "two hundred seventeen thousand, three hundred sixteen".